You'll probably get lots of answers from experts, but I'll chime in: this is our first year with TOG (Yr 1, Redesigned) and I'm really liking it. Ds is 11, and we're doing mainly Upper Grammar, with occasional Dialectic level work.
When I went to print out the 3-wk trial (Ancient Egypt), it made me crazy, because it WAS so many pages --- but now that I HAVE it, it's a little easier to understand.
Here's what's in there (as I recall - I don't have it right here):
an overview of what's going on in the week you'll be doing
a 2-page grid that has Church History/History/Literature/Crafts-Art 'stuff' and probably some things I don't recall. So you (for example) look at the level that your child is working at, and then look at what's written in the box next to the subject --- so, for example, we've been reading D'Aulaire's Greek Myths for literature/Upper Grammar level. The book suggestions usually have Dewey decimal numbers with them, so if you can't find a particular book in the library, chances are you can use a book that's next to it on the shelf.
Then there are writing suggestions (for all levels, I think - I don't usually use this)
There are answers to LG/UG literature questions (e.g., worksheets that they may have filled out for a book they read)
There are discussion questions for Dialectic and Rhetoric levels.
There are extensive teacher notes (many pages; a lot from World Book, but also other background info that helps you pull it all together, and know more than your student :) )
The student pages have instructions for geography and timeline work (iirc) and worksheets/graphical organizers based on some of the reading assignments.
My son is not very hands-on, so we typically just skip a lot of the craft projects, and focus on the reading --- but you can definitely tailor the program to how your own children best learn.
I can't really speak to the cost -- I happen to live in the same state as the woman who developed TOG, so a lot of the books are available through the libraries. I probably wdn't buy a book that was only going to be used for one week, but that's me!
The main spine for year 1 is the Usborne Internet-linked Encyclopedia of Ancient History, but even that isn't used as you would use a textbook. I'm not familiar with Spielvogel, so don't know how that would work.
I hope this was at least a start, and that other's with more experience will give you more answers!